The New Tokina AT-X 116 PRO DX-II is an update to the widely popular and award winning AT-X 116 PRO DX, 11-16 F/2.8 lens. The main update to this lens is in the Nikon mount, the AT-X 116 PRO DX-II has an internal Silent Drive-Motor (SD-M) to allow the lens to AF on Nikon bodies that do not have an AF drive gear and motor. There have also been some adjustments made to the coating for slightly improved optical performance. This compact ultra wide-angle zoom has a bright constant F/2.8 aperture make viewing and auto focus possible in lower light situations but still maintaining a reasonable size and weight. Two Super-Low Dispersion glass elements and two aspheric glass allow the proprietary optical design to achieve excellent contrast and sharpness as well as controlling chromatic aberration.